Add a project for the system solver and try an attempt to use decorator
in order to provide the necessary pieces for the system solver depending
on the gadget with a node is equipped with.
Finish a first version of the messaging arrangement to obtain values for
the matrix construction.
Moved some tests to organize them better respect to their intent.
First incomplete attempt to system computation steps.
Finish the skeleton for Netwon Raphson system one mutation.
Add projects for extension methods and useful semantic flow exceptions.
Factored the code in order to be more declarative using the extensions
method for dispatching on the node type.
Add the test to check that the parser result receiver is correctly
specified in the main network object.
Restricted a type in ParserResultReceiver method signature since the
loader knows that the result receiver has to be of that type.
Finish to refactor the code in order to describe the main network object
directly in the specification.
Refactor the way we ask the value for Literal and Uri nodes.
Add the reachability validator and tested it.